Bake-oven.



A. FINNILA.

BAKEovEN,

AFPLICTlON FILED JUNE 8.1914- l,12,803 PatentedSept. 7, 1915.

3 SHEETS-SHEET l.

CIS 1 A. FINNILA.

BAKE OVEN.

APPLICATION FILED JUNE 8.1\9I4.

1,152,803. PaIenIedsepI. 7, 1915.

3 SHEETS-SHEET 2.

z2 5 7 UJI/Wwe@ '36 COLUMBIA PLANoGRAPH co. WASHINGTON. D. c.

A. FINNILA.

BAKE OVEN.

APPLxcAnoN FILED JUNE 8.1914.

Patented Sept. 7', 1915.

3 SHEETS-SHEET 3.

iss

rear ends of ysaid tubes, in consequence of which, the temperature ofsaid gases is higher at said rear ends than it is at the frontv endswhere the gases pass from said tubes after having parted with someoftheir heat. 1t is noted that the tubes 15 are arranged in two separatebanks or series, a right series and a left series, each series beingindependent of the other by reason of a partition 19 that may be an archforming the roof of the `lire box 6. The floor of the baking chamber 16not only thickens rearwardly as clearly k shown in Figs. 3 and 5 butalso thickens at the front from the center toward the sidesV as clearlyshown in Fig. 2 and for this purpose the front ends of the tubes areydeflected downward increasingly from the center toward the sides, thefloor slabs 17 being horizontal from the centerl to the sides, so thatthere will be no tendency to over heatingofgthe floor slabs at the frontcorners. Thebaking'chamber 16 opens at its front end through the frontwall 1 and is there provided with a counterbalanced door 20. lProvision.is made for supplying steam to the baking chamber 16 and for thispurpose a steam pipe 21 led from a suitable source of supply, not shown,passes through the front wall 1 into the front end of the baking chamber16 and said pipe is provided with a suitable valve 22. By thisconstruction the air in the baking chamber 16 may be moistened toproduce any desired percentage of humidity for producing superior bakedfoods.

The top of the baking chamber 16 is constructed of longitudinallyarranged parallel open ended flues or tubes 23,'preferably arv rangedfrom side to side in the form of an arch and said tubes may be formed ofre tile or the like placed end to end. The tubes 23 are not all of thesame length but increase in length from the sides toward the center andthe rear ends of said tubes are flush with one another so that the frontends of the more central tubes are stepped forward beyond the front endsof the tubes nearer the sides. rlfhe forward ends of the tubes 23 arespaced apart from the front wall 1 to form lupper transversely extendingfront flues 2-1 which are separated one from the other Vby a partition25 that ex- `tends from the front wall 1 to the rear wall 2 and thatthus separates said tubesv into two banks or series, a left series and aright series.

The front walls of the upper front flues `24 are aslant forwardly fromthe sidesY tosented by the stepping of the tubes 23 so that the frontends of those of the tubes that are nearer the sides are spaced fartheraway from said'front walls than the front ends of they more centraltubes, thus diminishing the inlets into said tubes from the sides towardthe center so that the tubes nearer the sides will receive more heatthan the tubes nearer the center, thus tending, as I have discovered, toequable heating of the baking chamber. The upper front fiues 24 openinto vertical flues 26, one in each front front of the forward ends' ofthose bottom tubes 15 that are nearer the sides, and all of said bottomtubes being spaced apart from they front wall 1 sufficiently to formlower transversely extending front flues 27. lThe rear ends of the toplues 23 are 'spaced apart from the rear wall 2 to form uppertransversely extending rear flues 28 which open into a chimney 29. Thetop tubes 23 are spaced apart from the top t of the oven,

the front corners is thickened.E from thek center toward the sides soalso is the front wall 1 adjacent the baking chamber thickenedconsidera-bly from the center toward the sides, as clearly shownbydotted construction lines 32 in Fig. 4t, for the purpose of obtainingeven conduction of heat by said partition from the hot gases inthe lues26. Along both sides of the lire box 6 beneath the bottom lues 15 areprovided heat-insulations in the form of sand-beds 33.l The chimney 29is provided with a damper 34 operated from the front by a damper rod 35.

Provision is made for rapidly lowering the temperature of the bakingchamber 16 and for this purpose the baking chamber is provided with airvents 36 opening at their forward ends at both sides near the front endof saidl chamber, and extending upward at the sides of the chimney 29 tothe top thereof so as to Provide a strong draft tending to draw hot airout of the baking chamber. The vents 36 arev provided with dampers 37which are operated from the front by damper rods 38.

corner, vsaid flues extending downward in' They fire box 6 is providedat its rear end with a vertically extending V-shaped de-` flector 39projecting from the rear wall 2 in the median line of said lire box soas to divide o the gases of combustion and cause them to flow in equalquantities to the right and left into the lower rear lues 18. WhenV itis desired to use the bake oven, the doors 10, 11 will be opened and theburner 12 will be swung into the position shown in Fig. 1, and the fuelsupplied by said burner will be lighted and the outer door 11 will thenbe closed. vThen when the oven has reached the `desired bakingtemperature which may be indicated by the thermometer 10, Vthe articlesto be baked will be placed in the baking chamber 16.

The air passing into the fire box 6 through the grill 9 will be heatedby the burning gases and together with the gases of combustion will flowtoward the rear, heating the top 19 and also partly heating byconduction through the sides of the iire box the bottom tubes 15; thenceto the right and left through lues 18 into the rear ends of the bottomtubes 15; thence forward in said tubes further heating the floor slabs17 thence to the left and right in the flues 27 thence upward throughthe flues 26 into the front ends of the top tubes 28, thence rearwardthrough said top tubes to heat the top of the baking chamber; thenceinto the i'lues 28 and thence through said flues 2S toward the centerand by way of the chimney to the atmosphere.

Then the oven is sufficiently hot within the judgi'nent and experienceof the baker, the fuel may be cut olf from the burner 12 and said burnermay be swung into the position shown in solid lines, Figs. 5 and 6 andthe inner door 10 will then be closed and the baking process willcontinue until the articles have been baked, whereupon said articles maybe removed and other articles placed in the baking chamber' for baking,and from time to time the burner may be put into commission to maintaintheoven at a desired baking temperature or to increase the temperature.If the oven is too hot and bakes too quickly, the temperature of thebaking chamber' 16 will be readily lowered by opening the door 20 andoperating the dampers 37 to open the vents 3G so that the hot air willbe drawn out of said chamber. As the baking process proceeds the valve22 may be opened. from time to time as desired to supply moisture to thebaking chamber` so as to prevent burning of the articles being baked.

1. A bake oven comprising a lire box, a baking chamber of greater widththan the fire box, the top and bottom of said chamber each being formedof a series of separate tubes, the top and bottom tubes being incommunication with one anotherI at their front ends, a dead air cellalong the upper' side of each of the top tubes the bottom tubes at theirrear ends communicating with the fire box, and a chimney incommunication with the rear ends of the top tubes.

A bake oven comprising a fire box, a baking chamber above the fire box,the top of said fire box forming a portion of the bottom of the bakingchamber, the top and another portion of the bottom of said chamber eachbeing formed of right and leftsep-` arate series of longitudinal tubes,a right vertical Hue and a left vertical flue connecting the front endsof the right top and bottom and the left top and bottom seriesrespectiif'ely of the longitudinal tubes, the rear ends of the bottomtubes being in communication with the ire box, and a chimneycommunicating with the rear ends of the top tubes.

3. A bake oven provided with a baking chamber having its floor partiallyformed of longitudinally arranged tubes, and a iire box connected tosaid tubes, the top of said lire box partially forming the fluor of thebaking chamber.

4f. A bake oven` provided with a baking chamberhaving its top formed oftubes, a

dead air cell along the upper side of each of said tubes and a iire boxconnected to said tubes.

A bake oven provided with a baking chamber having its .floor and topformed of tubes placed side by side, said tubes communicating with oneanother at their front ends, an upper and a lower dead air cell alongthe upper side of each of the top tubes and a fire box connect-ed to therear ends of the floor tubes.

6. A bake oven, comprising a baking chamber having its floor formed o-ftubes, said floor increasing in thickness at the front end from thecenter toward the sides, and a fire box connected to the rear ends ofsaid tubes. c

7. A bake oyen, comprising a baking chamber havingits floor formed oftubes, said floor increasing in thickness from front to rear and alsoincreasing in thickness at the front from the center toward the sides,and a fire box connected to the rear ends of said tubes.

8. A bake oven comprising a tire box, a baking chamber having its topformed of longitudinally arranged tubes and communicating with the lirebox through inlets diminishing from the sides toward the center so thatthe tubes nearer the sides will receive more heat than the tubes nearerthe center, and a chimney connected with the rear ends of said tubes.

9. A bake oven comprising a baking chamber having its top formed oflongitudinally arranged tubes, the forward ends of the tubes beingspaced apart from the front wall to form transversely extending finesand the front ends of the more central tubes being stepped forwardbeyond the forward ends of the tubes nearer the sides, a lire boxconnected with the forward ends of the tubes, and a chimney connectedwith the rear ends of said tubes.

10. A bake oven comprising a fire box, a

baking chamber above the level of said fire boxand having its top andthe side portions of its bottom formed of tubes, the top of the fire boxforming the median portionfof said bottom, partitions separating saidtubes into right and left series for both top and bottom,vthe ends ofthe top tubes being spaced apart from the front and rear walls to formupper front iues and upper rear flues respectively and the ends of thebottom tubes y 'u nected with the upper rear flues.

11. A bake oven comprising a fire box, a baking chamber above the levelof said fire box and having its top and bottom formed of tubes,partitions separating said tubes into right and left series for both topand bottom, the ends of the top tubes being spaced apart from the'frontand rear walls to form upper front fines and upper rear fluesrespectively and the ends of the bottom tubes being spaced apart fromthe front and rear walls to form lower front flues and lower rear fluesrespectively, said lower rear flues opening into the lire box, avertical flue at each front corner opening into the upper and lowerfront ,-iues, the floor of the bak-k ing chamber being thickened fromfront to rear and said floor alsoincreasing in thickness at the frontend from the center toward the sides and the front wall adjacent thebakingchamber beingk thickened from the center toward the sides, and achimney connected with-the upperrear flue.

12. A bakekoven comprising a longitudinally extending fire box,a bakingchamber of greater width than and above the level of the fire box andyhaving its top and floor formed of open ended tubes, said top tubesbeing spaced apart from the top of the oven by dead air cells and saidfloor being aslant c upward from front to rear and thicker at the rearend between the bores ofthe Hoor tubesv and the baking chamber than atthe front end, flues connecting the front ends of the top tubes to thefront ends of the door tubes, and a chimney connected to the rear endsof the top tubes, the rear ends of the floor tubes communicating withthe lire box.

13. A bake oven `comprising a baking chamber, fiues above and below thebaking chamber connected with one another, a re box connected with saidflues and opening through the front wall of the oven, an inner and anvouter door spaced apart from one another at the open end of the firebox, and a burner mounted in the space between the inner and outerdoors.

111. A bake oven comprising a fire box, a baking chamber above the firebox and separated therefrom by al partition forming a portion of thefloor of thebaking chamber, tubes on both sides of the partition formingother portions of the floor ofthe baking chamber and separated therebyinto right and left series, separate flues connecting the fire box tothe rightand left series respectively, a chimney, and other separateflues connecting the chimney to the right and left series respectively.

15. A bake oven comprising a baking chamber havingits top constructed ofhollow tiles end to end to form an arch, each having separated bores andthe lower bores forming flues and the upper boresforming dead air cells,a fire box connected to the front ends of said flues, and a chimneyconnected to the rear ends of said flues.

In testimony whereof, I have hereunto set my hand at Los Angeles,California this 1st day of June 1914.

AUGUST FINNILA. In presence of- JAMES R. ToWNsnND, GEORGE H. Hines.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

\ Washington, D. G. l

